We investigate the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>ϕ</mi><mrow><mn>2</mn><mi>n</mi></mrow></msup></math> deformations of the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi mathvariant="normal">O</mi><mo stretchy="false">(</mo><mi>N</mi><mo stretchy="false">)</mo></mrow></math>-symmetric (generalized) free theories with a flat boundary, where <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>n</mi><mo>≥</mo><mn>2</mn></math> is an integer. The generalized free theories refer to the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mo>□</mo><mi>k</mi></msup></math> free scalar theories with a higher derivative kinetic term, which is related to the multicritical generalizations of the Lifshitz type. We assume that the (generalized) free theories and the deformed theories have boundary conformal symmetry and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi mathvariant="normal">O</mi><mo stretchy="false">(</mo><mi>N</mi><mo stretchy="false">)</mo></mrow></math> global symmetry. The leading anomalous dimensions of some boundary operators are derived from the bulk multiplet recombination and analyticity constraints. We find that the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>ε</mi><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></msup></math> expansion in the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>ϕ</mi><mn>6</mn></msup></math>-tricritical version of the special transition extends to other multicritical cases with larger odd integer <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>n</mi></math>, and most of the higher derivative cases involve a noninteger power expansion in <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>ε</mi></math>. Using the analytic bootstrap, we further verify that the multiplet-recombination results are consistent with boundary crossing symmetry.

China

Yongwei Guo

Wenliang Li

Boundary anomalous dimensions from BCFT: <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi mathvariant="normal">O</mi><mo stretchy="false">(</mo><mi>N</mi><mo stretchy="false">)</mo></mrow></math>-symmetric <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>ϕ</mi><mrow><mn>2</mn><mi>n</mi></mrow></msup></math> theories with a boundary and higher-derivative generalizations

In this work, real photon production scattering kernels from jet-medium interactions in the QCD medium are perturbatively calculated using the higher-twist (HT) formalism. Focus is given towards real photon production from a highly virtual (and highly energetic) quark, taking into account heavy-quark mass scales [<a href="http://dx.doi.org/10.1103/PhysRevC.94.054902">Phys. Rev. C 94, 054902 (2016)</a>], fermion-boson conversion processes [<a href="http://dx.doi.org/10.1016/j.nuclphysa.2007.06.009">Nucl. Phys. A 793, 128 (2007)</a>], as well as coherence effects [<a href="http://dx.doi.org/10.1103/PhysRevC.105.024908">Phys. Rev. C 105, 024908 (2022)</a>]. A generalized factorization procedure, such as that used in <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>e</mi><mtext>−</mtext><mi>A</mi></mrow></math> deep-inelastic scattering, is employed to derive an improved single-scattering medium-induced photon emission kernels that go beyond the traditional in-medium gluon exchange approximation. Diagrams with real-photon emission from the hard quark are classified based on the final-state particles, and include two types of scattering kernels at <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>O</mi><mo>(</mo><msub><mi>α</mi><mi>em</mi></msub><msub><mi>α</mi><mi>s</mi></msub><mo>)</mo></mrow></math> giving the following final states: (i) real photon and real quark, (ii) real photon and real gluon. The collisional kernels, thus derived, include full phase factors from all nonvanishing diagrams and complete second-order derivative terms in the transverse momentum gradient expansion. Moreover, the calculation includes heavy-quark mass effects, thus exploring heavy-quark energy loss. The in-medium parton distribution functions and the related jet transport coefficients have a hard transverse momentum dependence (of the emitted gluon or photon) present within the phase factor. It is observed that the jet transport coefficients resemble the transverse-momentum-dependent parton distribution functions.

Canada

Amit Kumar

Gojko Vujanovic

Bremsstrahlung photon contributions to parton energy loss at high virtuality <math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mi>Q</mi><mn>2</mn></msup></math>: A perturbative calculation at <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>O</mi><mo>(</mo><msub><mi>α</mi><mi>s</mi></msub><msub><mi>α</mi><mtext>em</mtext></msub><mo>)</mo></mrow></math>

The absence of definitive results for WIMP dark matter has sparked growing interest in alternative dark matter candidates, such as axions and axionlike particles (ALPs), which also provide insight into the strong CP problem. The Mitchell Institute Neutrino Experiment at Reactor (MINER), conducted at the Nuclear Science Center of Texas A&M University, investigated ALPs near a 1 MW h TRIGA nuclear reactor core, positioned approximately 4 m away. This experiment employed cryogenic sapphire detectors with a low detection threshold (<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mo>≈</mo><mn>100</mn><mtext> </mtext><mtext> </mtext><mi>eV</mi></math>), equipped with a transition edge sensor capable of detecting athermal phonons. Due to the low-background environment, we were able to exclude ALPs with axion-photon coupling and axion-electron coupling as small as <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>g</mi><mrow><mi>a</mi><mi>γ</mi><mi>γ</mi></mrow></msub><mo>=</mo><msup><mn>10</mn><mrow><mo>−</mo><mn>5</mn></mrow></msup></math> and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mi>g</mi><mrow><mi>a</mi><mi>e</mi><mi>e</mi></mrow></msub><mo>=</mo><msup><mn>10</mn><mrow><mo>−</mo><mn>7</mn></mrow></msup></math>, respectively. Energy depositions below 3 keV were not considered and remain blinded for our coherent elastic neutrino-nucleus scattering analysis. This is the first result demonstrating the MINER experiment’s potential to probe low-mass ALPs, enabled by its low-threshold detector and proximity to a reactor.

United States

M. Mirzakhani

W. Baker

India

M. Chaudhuri

J.B. Dent

R. Dey

B. Dutta

V. Iyer

A. Jastram

V.K.S. Kashyap

A. Kubik

K. Lang

R. Mahapatra

S. Maludze

N. Mirabolfathi

B. Mohanty

D. Mondal

H. Neog

Australia

J.L. Newstead

M. Platt

S. Sahoo

J. Sander

L.E. Strigari

J. Walker

MINER reactor based search for axionlike particles using sapphire (<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msub><mtext>Al</mtext><mn>2</mn></msub><msub><mi mathvariant="normal">O</mi><mn>3</mn></msub></math>) detectors

We measured the angular distributions for theC(Be,He)O transfer reaction at 35 MeV leading to several excited states ofO. The angular distribution of the ground state ofO was measured for the first time in this reaction. The corresponding Asymptotic Normalization Coefficients (ANC) of all the observed states were determined. The ANC of ground state, 6.92 MeV (2 <math altimg='si11.svg'><msup><mrow /><mo>+</mo></msup></math>) and 7.12 MeV (1 <math altimg='si40.svg'><msup><mrow /><mo>&#8722;</mo></msup></math>) subthreshold states ofO obtained from this work are utilized to determine the astrophysical <math altimg='si85.svg'><mi>E</mi></math>1 and <math altimg='si85.svg'><mi>E</mi></math>2 <math altimg='si16.svg'><mi>S</mi></math>-factors of theC( <math altimg='si17.svg'><msup><mrow><mi>&#945;</mi><mo>,</mo><mi>&#947;</mi><mo>)</mo></mrow><mn>16</mn></msup></math>O reaction in an <math altimg='si13.svg'><mi>R</mi></math>-matrix analysis.

K. Kundalia

D. Gupta

Sk M. Ali

R. Mitra

Swapan K. Saha

Spain

O. Tengblad

A. Perea

I. Martel

Sweden

J. Cederkall

A.M. Moro

The ANC of <math altimg='si1.svg'><msup><mrow /><mn>16</mn></msup></math>O states from <math altimg='si2.svg'><msup><mrow /><mn>7</mn></msup></math>Be + <math altimg='si3.svg'><msup><mrow /><mn>12</mn></msup></math>C <math altimg='si4.svg'><mi>&#945;</mi></math>-transfer reaction to study <math altimg='si3.svg'><msup><mrow /><mn>12</mn></msup></math>C( <math altimg='si17.svg'><msup><mrow><mi>&#945;</mi><mo>,</mo><mi>&#947;</mi><mo>)</mo></mrow><mn>16</mn></msup></math>O

A study on the Bose-Einstein correlations for triplets of same-sign pions is presented. The analysis is performed using proton-proton collisions at a centre-of-mass energy of $$ \sqrt{s} $$ = 7 TeV, recorded by the LHCb experiment, corresponding to an integrated luminosity of 1.0 fb . For the first time, the results are interpreted in the core-halo model. The parameters of the model are determined in regions of charged-particle multiplicity. This measurement provides insight into the nature of hadronisation in terms of coherence, being consistent with the presence of coherent emission of pions.

Netherlands

R. Aaij

United Kingdom

A. Abdelmotteleb

Switzerland

C. Abellan Beteta

F. Abudinén

T. Ackernley

A. Adefisoye

B. Adeva

M. Adinolfi

P. Adlarson

France

C. Agapopoulou

C. Aidala

Z. Ajaltouni

S. Akar

K. Akiba

Italy

P. Albicocco

Germany

J. Albrecht

F. Alessio

Z. Aliouche

P. Alvarez Cartelle

R. Amalric

Brazil

S. Amato

J. Amey

Y. Amhis

L. An

L. Anderlini

M. Andersson

P. Andreola

M. Andreotti

A. Anelli

D. Ao

F. Archilli

Z Areg

M. Argenton

Costa Rica

S. Arguedas Cuendis

A. Artamonov

M. Artuso

E. Aslanides

R. Ataíde Da Silva

M. Atzeni

B. Audurier

D. Bacher

I. Bachiller Perea

S. Bachmann

M. Bachmayer

J. Back

P. Baladron Rodriguez

V. Balagura

A. Balboni

W. Baldini

L. Balzani

H. Bao

J. Baptista de Souza Leite

C. Barbero Pretel

M. Barbetti

I. Barbosa

R. Barlow

M. Barnyakov

S. Barsuk

W. Barter

J. Bartz

Poland

S. Bashir

B. Batsukh

P. Battista

A. Bay

A. Beck

M. Becker

F. Bedeschi

I. Bediaga

N. Behling

S. Belin

K. Belous

I. Belov

I. Belyaev

G. Benane

G. Bencivenni

E. Ben-Haim

A. Berezhnoy

R. Bernet

S. Bernet Andres

A. Bertolin

C. Betancourt

F. Betti

J. Bex

Ia. Bezshyiko

Ukraine

O. Bezshyyko

J. Bhom

M. Bieker

N. Biesuz

P. Billoir

A. Biolchini

M. Birch

F. Bishop

A. Bitadze

A. Bizzeti

T. Blake

F. Blanc

J. Blank

S. Blusk

V. Bocharnikov

J. Boelhauve

Three-pion Bose-Einstein correlations measured in proton-proton collisions

In this paper, we present topological defects in (1, 1) dimensions, described by an extended nonlinear $\textit{O}$(3) sigma model. We consider spherical coordinates ($\textit{ϕ}$, $\textit{χ}$) in the isotopic space $\textit{S}$ and a potential $\textit{V}$ ($\textit{ϕ}$, $\textit{χ}$). For specific forms of the potential, the Bogomolnyi method is applicable, yielding first-order equations of motion with solutions that minimize energy. We study a model with an explicit solution for the field $\textit{ϕ}$ that resembles the ubiquitous sine-Gordon kink/antikink but with an internal structure given by the field $\textit{χ}$ with a form antilump/lump that depends on a constant $\textit{C}$. The soliton-antisoliton scattering process depends on $\textit{C}$ and on the initial velocity of the pair. Some results are reported, such as: one-bounce scattering for $\textit{ϕ}$, or strong radiation emission for $\textit{ϕ}$, followed by i) annihilation of $\textit{χ}$; ii) same pattern antilump-antilump or lump-antilump for $\textit{χ}$; iii) inversion antilump-antilump to lump-lump for $\textit{χ}$; iv) inversion antilump-lump to lump-antilump for $\textit{χ}$. Other findings are: v) annihilation of the soliton-antisoliton pair with the emission of scalar radiation; vi) emission of a pair of oscillating pulses around the vacuum. The energy density indicates that the defect possesses an internal structure, specifically as a nested defect of an antilump within a kink. The lump core of the defect is responsible for emitting radiation. The change in the structure of the defects during scattering is analyzed not only in terms of field profiles in the physical (1, 1) space but also in the internal $\textit{S}$ space, which provides new insight into the process.

Adalto Gomes

Fabiano Simas

Scattering of sine-Gordon kinks with internal structure in an extended nonlinear $\textit{O}$(3) sigma model

Orientifold planes play a crucial role in flux compactifications of string theory, and we demonstrate their deep connection to achieving scale-separated solutions. Specifically, we show that when an orientifold plane contributes at leading order to the non-zero value of the scalar potential, then either the weak coupling limit or the large volume limit implies scale separation, meaning that the Kaluza-Klein tower mass decouples from the inverse length scale of the lower-dimensional theory. Notably, in the supergravity limit such solutions are inherently scale-separated. This result is independent of the spacetime dimension and the dimensionality of the O$\textit{p}$-plane as long as $\textit{p <}$ 7. Similarly, we show, extending previous results, that parametric scale separation is not possible for isotropic compactifications with a leading curvature term that generically arise in the AdS/CFT context. We classify all possible flux compactification setups in both type IIA and type IIB string theory for O$\textit{p}$-planes with 2 ≤ $\textit{p}$ ≤ 6 and present their universal features. While the parametrically controlled scale-separated solutions are all AdS, we also find setups that allow for dS vacua. We prove that flux quantization prevents these dS vacua in isotropic compactifications from arising in a regime of parametric control.

George Tringas

Timm Wrase

Scale separation from O-planes

In this work, we investigate the power-expansion/OPE in super-renormalizable QFTs. In comparison to “marginal” short distance asymptotics, the power-expansion in super-renormalizable theory has a higher level of correlation with the coupling constant expansion, and the fixed-point perturbation theory for the coefficient functions suffers increasing level of IR divergences when the order of power-expansion/coupling constant expansion increases. This increasing IR sensitivity anticipates the presence of vacuum condensates of non-trivial local operators in the OPE, which not only cancel the IR divergences for coefficient functions through their UV divergences, but also shape the structure of logarithms at each power in the power-expansion. This UV-IR correspondence has been used to argue for the renormalon cancellation between coefficient functions and operators in marginal asymptotics, where the residue IR sensitivity of coefficient functions to be canceled by the operators manifests through high-order factorial growths after renormalization subtraction.

Yizhuang Liu

Renormalon-like factorial enhancements to power expansion/OPE in a super-renormalizable 2D $\textit{O}$($\textit{N}$) quartic model

The first observation of the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi mathvariant="normal">Σ</mi><mo>+</mo></msup><mo stretchy="false">→</mo><mi>p</mi><msup><mi>μ</mi><mo>+</mo></msup><msup><mi>μ</mi><mo>−</mo></msup></math> decay is reported with high significance using proton-proton collision data, corresponding to an integrated luminosity of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mn>5.4</mn><mtext> </mtext><mtext> </mtext><msup><mi>fb</mi><mrow><mo>−</mo><mn>1</mn></mrow></msup></math>, collected with the LHCb detector at a center-of-mass energy of 13 TeV. A yield of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mn>237</mn><mo>±</mo><mn>16</mn><mtext> </mtext><mtext> </mtext><msup><mrow><mi mathvariant="normal">Σ</mi></mrow><mrow><mo>+</mo></mrow></msup><mo stretchy="false">→</mo><mi>p</mi><msup><mrow><mi>μ</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>μ</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow></math> decays is obtained, where the uncertainty is statistical only. A branching fraction of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mo stretchy="false">(</mo><mn>1.08</mn><mo>±</mo><mn>0.17</mn><mo stretchy="false">)</mo><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>8</mn></mrow></msup></mrow></math> is measured, where the uncertainty includes statistical and systematic sources. No evidence of resonant structures is found in the dimuon invariant-mass distribution. All results are compatible with standard model expectations. This represents the rarest decay of a baryon ever observed.

A.S.W. Abdelmotteleb

A.A. Adefisoye

C.A. Aidala

CERN

J.L. Amey

A. Andreianov

D. Andreou

J.J. Back

I.R. Barbosa

R.J. Barlow

P.B. Battista

I.B. Bediaga

N.A. Behling

M.S. Bieker

N.V. Biesuz

F.C.R. Bishop

J.E. Blank

Observation of the Very Rare <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi mathvariant="normal">Σ</mi></mrow><mrow><mo>+</mo></mrow></msup><mo stretchy="false">→</mo><mi>p</mi><msup><mrow><mi>μ</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>μ</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow></math> Decay

The first observation of the $${{{{\varXi } ^0_{b}} \!\rightarrow {{J \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }} {{\varXi } ^-} {{\pi } ^+} }}$$ decay and the most precise measurement of the branching fraction of the $${{{\varLambda } ^0_{b}} \!\rightarrow {{J \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }} {{\varXi } ^-} {{K} ^+} }$$ decay are reported, using proton-proton collision data from the LHCb experiment collected in 2016–2018 at a centre-of-mass energy of 13 $$\text {\,Te\hspace{-1.00006pt}V}$$ , corresponding to an integrated luminosity of 5.4 $$\text {\,fb} ^{-1}$$ . Using the $${{{{\varLambda } ^0_{b}} \!\rightarrow {{J \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }} {\varLambda } }}$$ and $${{{{\varXi } ^-_{b}} \!\rightarrow {{J \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }} {{\varXi } ^-} }}$$ decays as normalisation channels, the ratios of branching fractions are measured to be where the first uncertainty is statistical and the second systematic.

C. Beteta

M. Alexander

P. Cartelle

S. Cuendis

R. Silva

I. Perea

Observation of the $${{{\varLambda } ^0_{b}} \!\rightarrow {{J \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }} {{\varXi } ^-} {{K} ^+} }$$ and $${{{{\varXi } ^0_{b}} \!\rightarrow {{J \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }} {{\varXi } ^-} {{\pi } ^+} }}$$ decays